Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 17,530	$ 19,285
Short-term investments	38,543	38,831
Accounts receivable, net of allowances of $551 and $3,625 at December 31, 2018 and 2017, respectively	18,462	22,244
Inventory	44,725	47,083
Prepaid expenses and other current assets	1,954	2,359
Total current assets	121,214	129,802
Property and equipment, net	19,778	18,110
Other non-current assets	196	241
Goodwill	3,881	3,881
Total assets	145,069	152,034
Current liabilities:
Accounts payable	4,643	4,666
Accrued compensation and employee related benefits	7,409	5,729
Accrued liabilities	2,887	3,162
Current portion of restructuring liabilities	582
Current portion of long-term debt	5,930	4,088
Current portion of capital lease obligations	523	936
Current portion of deferred rent	402	628
Current portion of deferred revenue	649	714
Total current liabilities	23,025	19,923
Long-term debt, net of current portion	17,633	5,500
Capital lease obligations, net of current portion	258	745
Long-term liabilities — other	304	532
Long-term restructuring liabilities	487
Deferred rent, net of current portion	5,294	5,891
Deferred revenue, net of current portion	185	501
Total liabilities	47,186	33,092
Commitments and contingencies (Note 10)
Stockholders' equity:
Preferred stock, $0.001 par value — 5,000 shares authorized, no shares issued and outstanding at December 31, 2018 and 2017
Common stock, $0.001 par value — 495,000 shares authorized, 21,492 and 20,973 shares issued and outstanding at December 31, 2018 and 2017, respectively	21	21
Additional paid-in capital	337,627	323,482
Accumulated other comprehensive loss	(9)	(36)
Accumulated deficit	(239,756)	(204,525)
Total stockholders' equity	97,883	118,942
Total liabilities and stockholders' equity	$ 145,069	$ 152,034